curl --request GET \
  --url 'https://{domain}/api/v2/affiliate/aff-billing/balances?api-key='

{
  "status": "success",
  "code": 200,
  "name": "OK",
  "message": "<string>",
  "info": {
    "affiliate-balance": {
      "approved": {
        "cpa": 123,
        "rev_share": 123
      },
      "pending": {
        "cpa": 123,
        "rev_share": 123
      },
      "available_advance": 123,
      "due_by_currencies": {},
      "balance_by_currencies": {},
      "currency": "<string>"
    }
  }
}